三栏布局
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>三栏布局</title>
<style>
#content::after {
content: '';
display: block;
clear: both;
}
.aside1 {
width:200px;
height:500px;
background:red;
float:left;
}
.aside2 {
width:200px;
height:500px;
background:blue;
float:right;
}
.main {
margin:0 210px;
height:700px;
background:pink;
}
#footer {
background:transparent;
}
</style>
</head>
<body>
<div id = "content">
<div class = "aside1"></div>
<div class = "aside2"></div>
<div class = "main"></div>
</div>
<div id = "footer"></div>
</body>
</html>
